Starting Out with Programming Logic and Design (4th Edition)
Starting Out with Programming Logic and Design (4th Edition)
4th Edition
ISBN: 9780133985078
Author: Tony Gaddis
Publisher: PEARSON
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Chapter 12, Problem 10PE

File Encryption

File encryption is the science of writing the contents of a file in a secret code. For this assignment you will design a program that opens a file and encrypts its contents. Assume the file that you are encrypting contains a list of strings.

The program should open the file and read its contents, one string at a time. As the program reads a string from the file, it substitutes each character of the string for an alternate character. It then writes the encoded string out to a second file. When the program is finished, the second file will be a version of the first file, but written in a secret code.

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We are considering the RSA encryption scheme. The involved numbers are small, so the communication is insecure.  Alice's public key (n,public_key) is (247,7). A code breaker manages to factories  247 = 13 x 19  Determine Alice's secret key. To solve the problem, you need not use the extended Euclid algorithm, but you may assume that her private key is one of the following numbers 31,35,55,59,77,89.
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Starting Out with Programming Logic and Design (4th Edition)

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